Datrys 2sqrt{12}*frac{sqrt{7}}{4}

$$2 \sqrt { 12 } \times \frac { \sqrt { 7 } } { 4 }$$

Enrhifo

$$\sqrt{21}\approx 4.582575695$$

Camau Ateb

Ffactora 12=2^{2}\times 3. Ailysgrifennu ail isradd y lluoswm \sqrt{2^{2}\times 3} fel lluoswm ail israddau \sqrt{2^{2}}\sqrt{3}. Cymryd isradd 2^{2}.

$$2\times 2\sqrt{3}\times \frac{\sqrt{7}}{4}$$

Lluosi 2 a 2 i gael 4.

$$4\sqrt{3}\times \frac{\sqrt{7}}{4}$$

Canslo 4 a 4.

$$\sqrt{7}\sqrt{3}$$

I luosi \sqrt{7} a \sqrt{3}, dylid lluosi'r rhifau dan yr ail isradd.

$$\sqrt{21}$$